Filter cartridge adapter



FIG. 1 is a left side elevation of a filter cartridge adapter showing our new design, the broken line showing of a pump and filter are for illustrative purposes only and forms no part of the claimed design;

FIG. 2 is a top perspective view;

FIG. 3 is a right side elevation;

FIG. 4 is a front end elevation;

FIG. 5 is a rear end elevation;

FIG. 6 is a bottom plan view; and,

FIG. 7 is a top plan view. 

The ornamental design for a filter cartridge adapter, as shown and described. 